Peace talks between the Sudanese government and two rebel groups were expected to resume Saturday, one day after Khartoum rejected a proposed security agreement designed to stop the violence in Sudan's western Darfur region.

On Friday, Sudan refused to sign an African-Union brokered security agreement that calls for a no-fly zone over Darfur, saying it was biased toward the rebels.

Negotiators at the talks in Abuja, Nigeria, say there are also disagreements over disarming pro-government Arab militias, known as the Janjaweed blamed for committing atrocities against black villagers in Darfur.

In other developments, Britain introduced a new U.N. Security Council resolution on Friday, urging Sudan's warring parties to commit to peace and threatening "further urgent action" against any group that fails to implement previous agreements.

Council members are expected to adopt the resolution later this month.